Yes, you can do a JAA IR in the sim so long as the aircraft is JAR 25 compliant. This involves checking the appropriate JARs which can be done online. (
www.jaa.nl)
However, if this is an INITIAL JAA IR eg for the purposes of converting a non JAA ATPL to a JAA one, the checkride/LST must be supervised by someone from an EU authority (eg, a CAA examiner of airmen) and the Sim Check pilot must be also JAA approved.